Powder-liquid dental curable material kit

Abstract

A powder-liquid dental curable material kit composed of (A) a liquid material and (B) a powder material, wherein the liquid material (A) contains (a1) a radically polymerizable (meth)acrylic monomer, (a2) an organic halogen compound and (a3) a radical chain transfer agent; the powder material (B) contains (b1) non-crosslinked resin particles, (b2) a pyrimidinetrione compound and (b3) an organic metal compound; and (Z) a peroxide is blended in at least one of the liquid material (A) and the powder material (B). This curable material kit is capable of reducing the heat generation during the curing of a curable material which is a mixture of the liquid material (A) and the powder material (B) and is not susceptible to the excessive prolongation of the curing time even when the curable material is cured by a brush-on technique, thereby ensuring an appropriate curing time for both of a brush-on technique and a kneading technique.

Description

TECHNICAL FIELD[0001]The present invention relates to a powder-liquid dental curable material kit composed of a liquid material and a powder material both of which are mixed together to be used for dental applications.BACKGROUND ART[0002]A powder-liquid curable material kit used in the field of dental treatment is composed of a liquid material containing a radically polymerizable (meth)acrylic monomer such as a lower alkyl(meth)acrylate-based monomer as the main component and a powder material containing a non-crosslinked resin such as polymethyl methacrylate as the main component, and a curable material is prepared by mixing together the powder material and the liquid material.[0003]In this curable material kit, a chemical polymerization type radical polymerization initiator composed of a plurality of constituent components is used to polymerize the above radically polymerizable (meth)acrylic monomer. That is, the constituent components of this chemical polymerization type polymeri...

AI Technical Summary

Benefits of technology

[0023]Since a combination of the organic halogen compound (a2), the pyrimidinetrione compound (b2) and the organic metal compound (b3) is used as the radical polymerization initiator and the radical chain transfer agent (a3) is used in the powder-liquid dental curable material kit of the present invention, heat generation during curing is suppressed and the curing rate can be slowed down and controlled according to the clinical situation. Further, since the peroxide (Z) is further used in addition to these, the excessive prolongation of the curing time when the liquid material (A) and the powder material (B) are mixed together by the brush-on technique is suppressed. That is, inconvenience that the curing time of the brush-on technique becomes too long as compared with the curing time of the kneading technique is avoided effectively, and the prolongation of the curing time in the brush-on technique is kept at a value slightly larger than that of the kneading technique.

[0024]As understood from this, the powder-liquid dental curable material kit of the present invention exhibits completely different behavior from that of the prior art when the brush-on technique is employed, whereby even when it is used for any one of these techniques as a shared kit for both of the brush-on technique and the kneading technique, there is no big difference in the prolongation of the curing time between them. Therefore, the kit of the present invention can be clinically advantageously used as a material which ensures high operability for both of the techniques.

[0025]In the present invention, the inventors of the present invention presume that the reason that the excessive prolongation of the curing time in the brush-on technique can be prevented is as follows.

[0026]As already stated above, the reason why the curing rate is slow and the curing time is long in the brush-on technique is presumed as follows. That is, since the mixing of the liquid material and the powder material is carried out by the penetration of the liquid material oozing out from the aforementioned absorbing material 3 of FIG. 1 into the powder material in this technique, oxygen required for a polymerization reaction runs short during curing as compared with the kneading technique in which these materials are forcedly stirred.

[0027]Therefore, according to the present invention, the peroxide becomes an oxygen supply source, thereby eliminating a shortage of oxygen during curing in the brush-on technique with the result that the excessive prolongation of the curing time is suppressed.

Problems solved by technology

However, when the curing time is controlled by this method, a polymerization reaction proceeds at once after the polymerization inhibitor is used up to delay curing and disappears.

Therefore, the technology is ineffective for the suppression of heat generation during curing.

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